Multiaxial graphite test specimen
Abstract
A multiaxial test program is to be conducted by Oak Ridge National Laboratory (ORNL) on the core component graphite. The objectives of the tests are to obtain failure data under uniaxial and biaxial states of stress in order to construct a failure surface in a two-dimensional stress space. These data will be used in verifying the accuracy of the maximum stress failure theory being proposed for use in designing the core graphite components. Tubular specimens are proposed to be used and are either loaded axially and/or subjected to internal pressure. This report includes a study on three specimen configurations. The conclusions of that study indicate that an elliptical transition geometry procedures the smallest discontinuity effects. Several loading combustions were studied using the elliptical transition specimen. The primary purpose is to establish the location of the highest stress state and its relation to the gage section for all of the loading conditions. The tension/internal pres sure loading condition (1:1) indicated that the high stress area is just outside the gage section but still should be acceptable. 5 refs., 18 figs.
- Publication Date:
- Research Org.:
- General Atomics Co., San Diego, CA (US)
- Sponsoring Org.:
- US Department of Energy (US)
- OSTI Identifier:
- 714688
- Report Number(s):
- DOE/HTGR-88147
TRN: US200509%%919
- DOE Contract Number:
- AC03-88SF17367
- Resource Type:
- Technical Report
- Resource Relation:
- Other Information: PBD: 1 Sep 1988
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; ACCURACY; FIGS; GEOMETRY; GRAPHITE; ORNL; A CODES; STRESS ANALYSIS; STRESSES; FINITE ELEMENT METHOD; HTGR TYPE REACTORS; TESTING; REACTOR CORES; FAILURES; CRACKS
Citation Formats
NONE. Multiaxial graphite test specimen. United States: N. p., 1988.
Web. doi:10.2172/714688.
NONE. Multiaxial graphite test specimen. United States. doi:10.2172/714688.
NONE. Thu .
"Multiaxial graphite test specimen". United States.
doi:10.2172/714688. https://www.osti.gov/servlets/purl/714688.
@article{osti_714688,
title = {Multiaxial graphite test specimen},
author = {NONE},
abstractNote = {A multiaxial test program is to be conducted by Oak Ridge National Laboratory (ORNL) on the core component graphite. The objectives of the tests are to obtain failure data under uniaxial and biaxial states of stress in order to construct a failure surface in a two-dimensional stress space. These data will be used in verifying the accuracy of the maximum stress failure theory being proposed for use in designing the core graphite components. Tubular specimens are proposed to be used and are either loaded axially and/or subjected to internal pressure. This report includes a study on three specimen configurations. The conclusions of that study indicate that an elliptical transition geometry procedures the smallest discontinuity effects. Several loading combustions were studied using the elliptical transition specimen. The primary purpose is to establish the location of the highest stress state and its relation to the gage section for all of the loading conditions. The tension/internal pres sure loading condition (1:1) indicated that the high stress area is just outside the gage section but still should be acceptable. 5 refs., 18 figs.},
doi = {10.2172/714688},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Sep 01 00:00:00 EDT 1988},
month = {Thu Sep 01 00:00:00 EDT 1988}
}
-
Incremental stress-strain law for graphite under multiaxial loadings
An incremental stress-strain law for describing the nonlinear, compressible and asymmetric behavior of graphite under tension and compression as well as complex loadings is derived based on a dry friction model in the theory of plasticity. Stress-strain relations are defined by longitudinal-lateral strain measurements for specimens under uniaxial tension-compression. Agreements with experimentally determined curves from biaxial loading experiments are shown. Agreements in finite element computations using the present model with strain measurements for diametral compression and 4-point bend tests of graphite are also obtained.